W. F. Bewlby 133 



inoculation results proved it to be the cause of the disease. A series of 

 cross-inoculations were undertaken with V. alho-atrum from the tomato, 

 cucumber and sweet-pea, upon tomatoes, cucumbers and sweet-peas. In 

 every case a definite wilt was produced and examination of the various 

 isolations indicated that the fungi from these host plants are identical. 



BIBLIOGRAPHY. 



1) Bewley, W. F. and Buddin, W. (1921). Ann. Apj). Biol, vili, JVo. I. 



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EXPLANATION OF PLATES IV-VII 



PLATE IV. 



Fig. 1. Diseased tomato stem cut longitudinally to show the browned wood caused by 



V. albo-atrum. 

 Fig. 2. Old diseased tomato stem showing the fungal outgrowth at the base. 

 Fig. 3. Micro-photograph of V. albo-atrum. 



PLATE V. 



Fig. 1. (1) Wilted plant six weeks after inoculation with V. albo-atrum. 



(2) Control plant. 

 Fig. 2. This photograph shows the wilted plant in Fig. 1 after being submitted to shade 



and an average temperature of 25° C. for 150 days. The wilted leaves have fallen off, 



but the plant has recovered and made good growth in the top. 



